add includedirs for swig

[tokomine]

When editing the *.i file for swig, sometimes you need to include the header files of third-party libraries.

swig --help
-I<dir>         - Look for SWIG files in directory <dir>

---

xmake.lua:

    add_files("*.i", {include_deps=true, include_pkgs=true, include_dirs=true})

[waruqi]

We need add there options, you can add includedirs directly.

please refer

xmake/xmake/rules/qt/moc/xmake.lua

Line 80 in 4262122

for _, pathmap in ipairs(pathmaps) do

[waruqi]

I don't think it's necessary to add this option, if the user configured add_packages and add_deps, their includes should be added automatically.